28/11/2013 Variable line-fluid pressure (VLP) transmissions www.allpar.com/mopar /tr ansmissi ons/variable-line-pressure.html 1/3 Variable line-fluid pressure (VLP) transmissions Transmissions with variable line-fluid pressure (VLP) frequently adjust theirinternal fluid pressure to reduce parasiti c losses from the pump and hyd rauli c system, increasing gas mileage and lengthening the transmission lifespan. VLP was phased in throughout the Chrysler four-speed automatics, both carand truck versions, in model -year 2006 (actual producti on started in late 2005). In the first year, rear wheel drive automatics connected to the 2.7 liter and 3.7 liter V6 engines gained it; in 2007, all Chryslertransmissions used it. The first related patent Allpar could find was issued to DaimlerChrysler (Auburn Hills, indicating ChryslerGroup development) — patent 6,471,613 was issued for a regulator valve system with a variable fo rce solenoid. The inventors, Valentin Botosan and Berthold Martin, wrote that the ideal was to maintain a lowertransmission fluid pressure without letting the clutch slip, because it increases both gas mileage and the transmissi on’s lifespan. However, increased pressure is needed in low gears or under load, for better clutch- holding ca pabili ty. Choosing the desired line pressure was based on the output of input and output speed sensors, which combined provided an indication of clutch slip. The powertrain control module (engine computer) considered this information as well as the throttle angle and engine torque, so that under higher torque, higher throttle (indicating a forthcoming increase in torque), or clutch slip, pressure could be quickly raised. In February 2006 , Botosan and Martin fil ed another patent, this time for a revised hydraulic control system, E xplore Allpar! PopularCars Trucks Social News Components Brands Tech Heritage People Find It Now Search AllparSearch Cars• Trucks Engines• Forums Repairs•ByYearPlymouth 1966-196 9 Driven: Alfa Romeo Giulietta The first Ram Cummins trucks McKee Plymouth ATEX Explosiones&Segurida www.puncernau.net ATEX Asesoria Ensayos Reac LabEqui Supresión Apa gallam as Inertizacion Low-Cost Solenoid Valves Valve Leak Testing (LDS) Fichero de Morosos Rastreator™ Seguros Coche
